System and method for dynamic privacy screen on an OLED display

Patent metadata

Field	Value
Publication number	US-11315989-B2
Application number	US-202017039459-A
Country	US
Kind code	B2
Filing date	Sep 30, 2020
Priority date	Sep 30, 2020
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

An organic light emitting diode (OLED) display includes an OLED panel and an electroconductive (EC) filter. The OLED panel provides an image. The EC filter permits the image to be viewed within a first viewing angle in response to a first voltage applied to the EC filter, and permits the image to be viewed exclusively within a second viewing angle in response to a second voltage applied to the EC filter.

First claim

What is claimed is:

1. An organic light emitting diode (OLED) display, comprising:
an OLED panel configured to provide an image; and
an electroconductive (EC) filter configured to permit the image to be viewed within a first viewing angle in response to a first voltage applied to the EC filter, and to permit the image to be viewed exclusively within a second viewing angle in response to a second voltage applied to the EC filter, the first voltage being different from the second voltage, and the first viewing angle being greater than the second viewing angle.

2. The OLED display of claim 1 , further comprising a controller configured to apply the first and second voltages to the EC filter.

3. The OLED display of claim 2 , wherein:
the controller is further configured to apply a third voltage to the EC filter, the third voltage being between the first and second voltages; and
the EC filter is further configured to permit the image to be viewed exclusively within a third viewing angle in response to the third voltage, the third viewing angle being between the first and second viewing angles.

4. The OLED display of claim 2 , wherein the first voltage is less than the second voltage.

5. The OLED display of claim 1 , wherein the EC filter includes first and second transparent conductive oxide layers, and an electroconductive polymer layer sandwiched between the first and the second oxide layers.

6. The OLED display of claim 5 , wherein the first and second oxide layers are formed of a thin film of one of a zinc oxide and an indium-tin oxide.

7. The OLED display of claim 5 , wherein the polymer layer is formed of a polyalinine polymer.

8. The OLED display of claim 1 , further comprising a mirrored panel.

9. The OLED display of claim 8 , further comprising a quarter-wave plate sandwiched between the OLED panel and the EC filter.

10. The OLED display of claim 1 , wherein the first viewing angle is greater than +/−85 degrees, and the second viewing angle is less than +/−45 degrees.

11. A method for providing a dynamic privacy screen on an organic light emitting diode (OLED) display, the method comprising:
displaying, on an OLED panel of the OLED display, an image;
permitting, by an electroconductive (EC) filter of the OLED display, the image to be viewed within a first viewing angle in response to a first voltage applied to the EC filter; and
permitting, by the EC filter, the image to be viewed exclusively within a second viewing angle in response to a second voltage applied to the EC filter, the first voltage being different from the first voltage, and the first viewing angle being greater than the second viewing angle.

12. The method display of claim 11 , further comprising applying, by a controller of the OLED display, the first and second voltages to the EC filter.

13. The method of claim 12 , further comprising:
applying, by the controller, a third voltage to the EC filter, the third voltage being between the first and second voltages; and
permitting, by the EC filter, the image to be viewed exclusively within a third viewing angle in response to the third voltage, the third viewing angle being between the first and second viewing angles.

14. The method display of claim 12 , wherein the first voltage is less than the second voltage.

15. The OLED method of claim 11 , wherein the EC filter includes first and second transparent conductive oxide layers, and an electroconductive polymer layer sandwiched between the first and the second oxide layers.

16. The method of claim 15 , wherein the first and second oxide layers are formed of a thin film of one of a zinc oxide and an indium-tin oxide.

17. The method of claim 15 , wherein the polymer layer is formed of a polyalinine polymer.

18. The method of claim 11 , wherein the OLED panel further includes a mirrored panel.

19. The method of claim 18 , wherein the OLED panel further includes a quarter-wave plate sandwiched between the OLED panel and the EC filter.

20. An Organic Light Emitting Diode (OLED) display, comprising:
a transparent OLED panel configured to provide an image in a first direction and in a second direction, the first direction being opposite to the second direction;
a first electroconductive (EC) filter configured to permit the image to be viewed in the first direction within a first viewing angle in response to a first voltage applied to the first EC filter, and to permit the image to be viewed in the first direction exclusively within a second viewing angle in response to a second voltage applied to the first EC filter, the first voltage being different from the first voltage, and the first viewing angle being greater than the second viewing angle; and
a second electroconductive (EC) filter configured to permit the image to be viewed in the second direction within a third viewing angle in response to a third voltage applied to the second EC filter, and to permit the image to be viewed in the second direction exclusively within a fourth viewing angle in response to a fourth voltage applied to the second EC filter, the third voltage being different from the fourth voltage, and the third viewing angle being greater than the fourth viewing angle.

Assignees

• Dell Products Lp

Inventors

• Aurongzeb Deeder
• Lee Jongseo
• Siddiqui Asim

Classifications

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H01L2251/308

  Electricity · mapped topic

• H01L27/3232 Primary

  Electricity · mapped topic

• H01L51/5281

  Electricity · mapped topic

• H01L2251/306

  Electricity · mapped topic